Continuity mistake: Shaggy's shoe keeps going from clean to covered with bat guano in several shots.
Big Scare in the Big Easy - S1-E4
Continuity mistake: Crawdad Mike goes from having a full head of hair when he's unmasked as one of the ghosts to being bald on top in the next shot.
It's Mean, It's Green, It's the Mystery Machine - S1-E5
Continuity mistake: When the van crashes into a wall, the emblem falls off. In the drive in scene, the emblem magically reappears.
Pompeii and Circumstance - S1-E12
Continuity mistake: As Daphne is talking about the old statues in the window, an Italian wearing glasses comes up and talks back, who has normal eyes. Just before it cuts away, he stops moving and suddenly the irises of his eyes are hollow, where the drawing was unfinished. (00:02:15)
Pompeii and Circumstance - S1-E12
Continuity mistake: It is Daphne who swoops in with the golf cart and saves the gang from the Gladiator zombie. Yet moments later, Fred is driving. Ironically while thanking her for saving them. (00:09:00)
Pompeii and Circumstance - S1-E12
Continuity mistake: When the Gladiator Zombie is chasing the Mystery Gang in the golf cart, he flicks his whip at them. Scooby is seen on the left side of the back seat looking out and covers his eyes. The very next shot, Scooby is suddenly on the right side of the seat looking forward. (00:09:15)
Pompeii and Circumstance - S1-E12
Continuity mistake: When Captain Guzman puts the artifact into a chest, Scooby quickly sniffs around inside and then has the lid almost slammed on his nose. Scooby jumps up quickly and holds his nose in shock. The shot changes and suddenly Scooby is a considerable distance away from the chest. (00:14:00)
Answer: Because of the goo that was on it.